/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.commons.udf.builtin;

import org.apache.iotdb.commons.exception.MetadataException;
import org.apache.iotdb.commons.udf.utils.UDFDataTypeTransformer;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.udf.api.UDTF;
import org.apache.iotdb.udf.api.access.Row;
import org.apache.iotdb.udf.api.collector.PointCollector;
import org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations;
import org.apache.iotdb.udf.api.customizer.parameter.UDFParameterValidator;
import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters;
import org.apache.iotdb.udf.api.customizer.strategy.RowByRowAccessStrategy;
import org.apache.iotdb.udf.api.exception.UDFException;
import org.apache.iotdb.udf.api.exception.UDFInputSeriesDataTypeNotValidException;
import org.apache.iotdb.udf.api.type.Type;

import java.io.IOException;

public class UDTFInRange implements UDTF {
    protected TSDataType dataType;
    protected double upper;
    protected double lower;

    @Override
    public void validate(UDFParameterValidator validator) throws UDFException {
        validator
                .validateInputSeriesNumber(1)
                .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE)
                .validateRequiredAttribute("upper")
                .validateRequiredAttribute("lower")
                .validate(
                        args -> (Double) args[0] >= (Double) args[1],
                        "Upper can not be smaller than lower.",
                        validator.getParameters().getDouble("upper"),
                        validator.getParameters().getDouble("lower"));
    }

    @Override
    public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations)
            throws MetadataException {
        upper = parameters.getDouble("upper");
        lower = parameters.getDouble("lower");
        dataType = UDFDataTypeTransformer.transformToTsDataType(parameters.getDataType(0));
        configurations.setAccessStrategy(new RowByRowAccessStrategy()).setOutputDataType(Type.BOOLEAN);
    }

    @Override
    public void transform(Row row, PointCollector collector)
            throws UDFInputSeriesDataTypeNotValidException, IOException {
        long time = row.getTime();
        switch (dataType) {
            case INT32:
                collector.putBoolean(time, row.getInt(0) >= lower && upper >= row.getInt(0));
                break;
            case INT64:
                collector.putBoolean(time, row.getLong(0) >= lower && upper >= row.getLong(0));
                break;
            case FLOAT:
                collector.putBoolean(time, row.getFloat(0) >= lower && upper >= row.getFloat(0));
                break;
            case DOUBLE:
                collector.putBoolean(time, row.getDouble(0) >= lower && upper >= row.getDouble(0));
                break;
            default:
                // This will not happen.
                throw new UDFInputSeriesDataTypeNotValidException(
                        0,
                        UDFDataTypeTransformer.transformToUDFDataType(dataType),
                        Type.INT32,
                        Type.INT64,
                        Type.FLOAT,
                        Type.DOUBLE);
        }
    }
}
